Add the path of your portage overlay to your catalyst-spec (in the portage_overlay keyword), then add packages from that overlay to your stage4/packages keyword. It should just work.
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Sebastian Kuzminsky
From: anonymous0@openmailbox.org <anonymous0@openmailbox.org> Sent: Friday, October 14, 2016 4:59:16 PM To: gentoo-catalyst@lists.gentoo.org Subject: [gentoo-catalyst] Use custom overlays in Catalyst
Hi. I want to build own iso image with Catalyst. How I can add ebuilds from overlays to list of packages which will be installed?